A U.S. drone entered Iranian airspace over the Persian Gulf according to Iran. They released an image of a downed air craft on state TV. An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft which is automated and does not require a human pilot on board.
U.S. Navy, however, says that they have all the air crafts in that region and have lost none.
There is tension in the Gulf regarding the U.S. surveillance in that area. It is possible that some old drone that was found in the sea earlier and being shown as a recent aircraft.
United Arab Emirates also uses ScanEagle drones.